I just printed this, and working on assembly. There is one piece that isn't clear between thingiverse and your blog - what is actually driving the filament? I understand that on the big gear, there is the M5 bolt, and then a bearing, and then the '3mm drive gear', and then another bearing.

By 3mm drive gear, do you mean that it is a drive gear appropriate for 3mm filiment - like one of these: http://reprap.org/wiki/Drive-gear ? Was there a particular version you used?

I am going to be modifying the model to do 1.75mm fillament, and per your comment about the measurements, it would help to know which gear you used.

Thanks. I have a preliminary STL set that I am going to test. The Mk7 says it's good for both 3mm and 1.75 -- the only factor that might take me a few tries is if I have to move the guide holes, instead of just shrinking them. My first go just took the STL into blender, isolated the holes, and scaled down each end locking the correct axis to prevent ruining the top and bottom.

I actually expect it will work just fine, as long as there is an extra 0.75mm of flex in the tension arm that presses the idler bearing in to the drive gear. I have had luck doing the same thing in the past, (i.e http://www.thingiverse.com/thing:339581 on my profile).

I will comment back in a week or two if it works out. I have to source or make the drive gear, so it will be a bit.

hi, congratulations for that extruder! please, could you upload the .stl files of te DoubleMiniFalaUNION?? is the xcarriegedouble.stl same piece? how can i calibrate the 2 extruders for a 2 materials printed piece? (i have arduino mega 2560) thanks!!

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